Dry kiln



N. H. AND H. L. HENDERSON.

DRY KILN.

APPLlCATlON HLED MAY14, l l- 1 fi fifi Paten'wd July 121 1922..

2 SHEElS-SHEET I.

ATTORNEYS] NELSON H. HENDERSON AND HIRAM L. HENDERSQN, SYRACUSE NEW YQRELQ DRY KEEN.

Application filed May 14,

To all whom it may com-em Be it known that we, NELSON H. HENDER- soN and HIRAM L. HENDERSON, citizens of the United States, and residents of Syracuse, in the county of Onondaga and State of New York, have invented a certain new and useful Dry Kiln, of which the following is a specification.

This invention relates to dry kilns of the class used for drying lumber and other wood products, coats of paint, varnish etc. on articles as the so-called siccative coatings, enamel on leather etc., and has for its object construction and means for effecting and controlling the circulation of the atmosphereof the kiln and the taking in and humiditying of vouter air and also the recirculating of the atmosphere in the kiln, which kiln is particularly simple in construction andv especially economical to operate.

The invention consists in the novel features and in the combinations and constructions and relative arrangement of the controlling means hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a fragmentary plan view of a kiln embodying our invention.

Figure 2 is a fragmentary sectional View.

This kiln comprises generally, a drying room and a heating chamber below the drying room in communication therewith, and a steam injector arranged to circulate the atmosphere in the kiln and to maintain the humidity of the atmosphere and also to draw in, humidity and circulate outside air and to create a. draft in the stacks.

1 designates the kiln which consists of the usual enclosing walls. 2 is the drying room. 3 is the heating chamber below the central portion of the drying room and communicating therewith, the drying room being separated from the chamber 3 merely by suitable supports as beams 41 for supporting rails 5 for the trucks 6 which carry the lumber or other material to be dried. The kiln here shown is formed double and has stacks 8 on opposite sides thereof. The. kiln in keeping with the double construction is also provided with a recirculatlng chamber 9 located on opposite sides of the chamber 3 and communicating with the side portions of the drying room 2. The stacks 8 com- Specification of Letters Patent.

Patented July 11, 1922..

1921. Serial No. 469,601.

municate at 10 with the lower portions of the chambers 9. The partitions 11 which separate the chambers 9. from the chamber 3 are formed with automatically operated means as dampers 12 which swin inwardly into the chamber 3 to automatica ly control the circulation from the chambers 9 to the chamber 3. When the pressure in the circulating chambers 9 is greater than that in the heating chamber 3 the dampers 12 will open inwardly by the pressure and a portion of the atmosphere which would otherwise pass out through the stacks, passes the dampers 12 into the chamber 3 and is recirculated through the drying room.

As here illustrated, the kiln is provided with air ducts 14 extending along its bot tom transversely thereof from the sides and formed with outlets 15 into the circulating chamber 3 and also with inlets 16 into the chambers 9, these ducts also communicating with the inlets 17 for the outside air. Said ducts 14 extend from each side of the kiln toward the other side and those projecting from the air intake 17 and also recirculate'v the atmosphere entering through the inlets 16 from the chambers 9. As hereshown, the injector is located adjacent each air intake and suitable means as a damper 20 is provided in each duct for controlling the flow of air from, the air inlet 17 and also for controlling the recirculation of air from the chamber 9 through the inlet 16.

When this damper cuts off more or less the inlet of air from the air inlet 17, it correspondingly opens more or less the recirculating passage 16.

21 are dampers in the openings 10 connecting the chamber 9 and the stacks for controlling the flow through the stack and regulating the pressure in the chambers 9.

22 are heating coils located in the chamher 3 and connected to a suitable source of steam .supply. Steam pipes extend longitudinally at intervals into the chamber 3 as the pipe 23 which has discharge openings 24 for discharging steam into the kiln when thermometers to guide the operator in open- A out through the outlets and steam pipes.

ing and closing the dampers, the injectors In operation, the steam projected from the injectors 18 passes through the ducts 14 past the heating coils 22 by which it is heate and circulates upwardly through the drying room to the top thereof where the current of atmosphere is divided into two currents by the baffie plate 26, which currents pass laterally and downwardly along the sides of thedrying room and kiln into-the chambers 9 and out through the stacks.

Part of the atmosphere may be' again recirculated by passing the dampers 12 which automatically operate when the'pressure in the'chamber 3 is less than that in the chambers 9. Also by closing the dampers 21 of the stacks the pressure in the chambers 9 can be raised so as tov cause recirculation past the valves or dampers 12. By operating the damper 20 to partly or wholly closethe air inlet 17, a partial or nearly complete recirculation is eflected by means of the 1njector 18 from the chambers 9 through inlet passages 16 of the ducts 14. By opening the dampers 21 more or less the draft in the stacks can be increased or diminished to suit requirements. Additional steam when re quired, can be taken in through the pipe 23; j

Owing to the use of the injectors a positive circulation is maintained in the kiln and also in the stacks and the medium usedto maintain the circulation also supplies the moisture for efl'ecting the drying of the lumber or coatings, hence the injector performs the functions of maintaining the circulation,

humidifying the atmosphere and creating the draft in the stacks. Hence, this kiln is more economical in operation than when fans and other mechanical blowers for cir culating the atmosphere are employed or when the draft is maintained in the stacks by the use of additional coils or draft producing devices in the stacks.

What we claim is:

1. A dry kiln having an air inlet and a steam injector arranged to draw the air in through the'inlet into the kiln, substantially as and for the purpose described.

2. A dry kiln having a passage provided with an outside air inlet and discharge outlets into the kiln, and a steam blower between such inlet and the outlets, substantially as and for the purpose specified.

3. A dry kiln provided with a passage having an inlet in the kiln and an outlet to 1,4aaaoa the kiln, and a steam injector arranged in the passage between the inlet and the outlet to in position to recirculate the atmosphere of the kiln and also draw in air through the air inlet and humidify the same, substantially as and for the purpose described.

5. A dry kiln having a circulating passage having an inlet into the interior of the kiln, an air inlet communicating with the circulating passage and with the outside of the kiln, and an outlet into the kiln, and a steam blower arran ed in the circulating passage between sai? inlets and said outlet in position recirculate the atmosphere of the kiln and also draw inair throu h the inlet, and means forcontrolling the ow through such inlets, substantially as and for the purpose specified.

6. A dry1kiln having a passage provided with an outside air inlet and discharge outlet intofthe kiln, "a steam blower between such inlet and theou'tlet, and means for con trolling the flow of' air through the inlet, substantially as and for. the .purpose described. i

7: A dry kiln provided: with a passage having an inlet in the kiln and an outlet topthe kiln, and a steam injector arranged in 1 the passage between the inlet and theoutlet to maintain circulation. of the atmosphere in the kiln and to supply moisture to such atmosphere, and "means forcontrolling the flow through the inlet, substantially as and for the purpose set forth.

8. In a dry kiln, a recirculating passage, a steam injector arranged in the passage and operating to maintain the circulation of the atmopshere in the kiln, and means for controlling the recirculation of the atmosphere by the injector, substantially, as and for the purpose specified.

9. In a dry kiln, a circulating passage extending along the bottom of the chamber and having openings in its top into the interior of the kiln, and a steam injector arranged in said passage, substantially as and for the purpose set forth. v

10. In a dry kiln, a passage along the bottom of the kiln and having outlets in its top into the interior of the kiln, and also having an inlet at one end into the kiln, and a steam injector arranged in the passage between the inlet and the outlet, substantially as and for the purpose described.

aneaeea 11. A dry kiln having a passage extend ing along the bottom of the kiln and provided with outlets in the top wall into the kiln, an air inlet communicating with such passage at one end, and a steam injector .located in the passage between the air inlet and the outlets, substantially as and for the purpose specified.

12. In a dry kiln, a passage extending along the bottom ofthe kiln and having outlets in the top wall into thekiln, and an air inlet communicating with such passage at one end, and a steam injector located in the passage between the inlet and the outlet, and means for controlling the flow of air from the inlet into the passage, substanti all as and for the purpose set forth.

13. In a dry kiln, ducts extending transversely from each side of the kiln toward the other side, the ducts extending from one side alternating with those projecting from the other, and the ducts having outlets in their upper sides into the kiln, a steam injector located'in each duct in position to force air through the ducts and the outlets thereof and circulating the same in the kiln, substantially as and for the purpose described.

14. In a dry kiln, ducts extending transversely from each side of the kiln toward the other side, the ducts extending from one side alternating with those projecting from the other and the ducts having outlets in their upper sides into the kiln, each duct having an inlet leading from the interior kiln near the side of the kiln from which the duct projects, and a stream-injector located in each duct between the inlet and the outlet thereof for circulating the atmosphere through the du cts upwardly through the kiln and downwardly along the sides of the kiln and into the ducts, substantially as and for the purpose specified.

15. A dry kiln having a drying room in the upper portion thereof and a heating chamber below the central part of the drying room and circulating chambers at opposite sides of the former chamber, such chambers opening into the bottom of the drying room, automatic pressure operated dampers in the partitions between the circulating chambers and the heating chamber, chimneys communicating .with the circulating chambers, and means for circulating the atmosphere upwardly through the heating chamber. the dryingvroom, downwardly along the sides of the kiln into the circulating chambers, substantially as and for the purpose set forth.

16. A dry kiln having a drying room in the upper portion thereof and a heating chamber below the central part of the drying room and circulating chambers at opposite sides of the former chamber, such chambers opening into the bottom of the drying room, automatic pressure operated dampers in the partitions between the circulating chambers I and the heating chamber, chimneys communicating with the circulating chambers, and a steam blower arranged to circulate the atmosphere in the kiln and supply mois- Sture thereto, substantially as and for the of the former chamber, such chambers opening into the bottom of the drying room, automatic pressure operated dampers in the partitions between the circulating chambers and the heating chamber, chimneys communicating with the circulating chambers, an air duct having outlets into the heating chamber, and having an inlet for outside air, and a steam injector in the duct between the air inlet and the outletof the duct, substantially as and for the purpose specified.

18. A dry kiln having a drying room in the upper portion thereof, and a heating chamber below the central part of the drying room and circulating chambers at opposite sides of the former chamber, such chambers opening into the-bottom of the drying room, automatic pressure operated dampers in the partitions between the circulatingschambers and the heating chamber, chimneys communicating with the circulating chambers, air ducts communicating respectively with the circulating chambers, and with the outside air and having outlets into the heating chamber, and a steam injector in the ducts between the inlets and outlets thereof, sub-, stantially as for the purpose set forth.

19. A dry kiln having a drying room in the upper portion thereof, and a heating chamber below the central part of the drying room and circulating chambers at opposite sides of the former chamber, such chambers opening into the bottom of the drying room, automatic pressure operated dampers in the partitions between the circulating chambers and the heating chamber, chimneys communicating with the circulatingchambers, air ducts communicating respectively with the circulating chambers and with the outside air and having outlets into the heating chamber, and a steam injector in the ducts between the inlets and outlets thereof, and means for controlling the flow through the inlets of the ducts, and means for controlling the flow through the chimneys, substantially as and for the purpose described.

20. A dry kiln having a drying room in the upper part thereof, a heating chamber below the central part of the drying room and recirculating chambers below opposite sides of the drying room and at opposite sides of the circulating chamber, partitions separating the chambers, depending inwardly swinging dampers in said partition,

stacks communicating with the lower; portions of the recirculating chambers, and

' means in the kiln for circulating the atmos phere. therein, substantially as and for the purpose. specified. Y v 21. A dry kiln having a drying room in the upper part thereof, a heating chamber below the central part of the drying room and recirculating chambers below opposite.

- eating with the lower portions of the circulating chambers, and a steam injector arranged to force atmosphere upwardly through the circulating chamber, the drying room and downwardly along the sides ofthe kiln into the recirculating chambers,

substantially as and for the purpose set forth. g

22.. In-a drying kiln having a drying room in the upper portion thereof, a heating chamber. below the central portion of the drying room and openin at its top into the drying room, circulat ng chambers below the side portions -of the drying room .and at opposite sides of the former chamber, inwardly swinging dampers in the partition s' separating said chambers, ducts extending horizontally along the bottom of the kiln and having outlet openings into the heating chamber and also having inlets communicating with the circulating chambers, and a steam injector located in the ducts,

substantially as and for the purpose described.

'23. In a dry kiln having a drying room in tlfe upper portion thereof, a heating chamber below the central portion of the drying room and opening into' the drying room, additional chambers below the side portions of the drying room and at opposite sides of the former chambers, inwardly swinging dampers in the partition separating said chambers, ducts extending horizontally along the bottom of the kiln and having outlet openings into the former ing respectively with the additional chambers, outside air inlets opening into the ducts, means for controlling the flowof the atmosphere from the circulating chambers into the duct and for controlling the flow of outside air in the duct, and a steam injector arranged in the ducts between the inlets and outlets thereof, substantially as and for the purpose specified. 24. In a dry kiln havin an air inlet, and

a steam injector arrange to draw the air into the intake, circulate it in the kiln and supply moisture thereto, substantially asand for the purpose described.

25. A dry kiln, an air intake and recirculating passages and a steam injectorarranged to draw the air through the intake and through the recirculating passage and to circulate the atmosphere in the kiln, substantially as and for the purpose specified.

26. In a dry kiln, a steam injector arranged to circulate the atmosphere of the kiln and supply additional moisture thereto, substantially as and for the purpose set forth.

27. A dry kiln having a stack and a steam blower arranged in the kiln andarranged to circulate the atmosphere from the kiln and through the stack, substantially as and for the purpose described.

28. A dry kiln having a receiving chamber and a recirculating chamber, a steam blower arranged to force the air through the first mentioned chamber and through the kiln and into the recirculating chamber, and

munication between the recirculating chamber and the first mentioned chamber, substantially as and for the purpose specified. Y

29. A dry kiln having an outlet and an air inlet, and a circulating passage and a steam blower arranged to draw the air through the-air inlet and effect a circulation thereof through the kiln and through the outlet, and means for controlling the outlet whereby the atmopshere of the kiln is recirculated by the steam blower, substantially as and for the purpose set forth.

30. In a dry kiln having an air inlet, a steam blower arranged to draw the air through an inlet and circulate the same through the kiln, and means for supplying additional steam to the air in the kiln, substantially as and for the purpose described. chamber and also having inlets communicat- NELSON H. HENDERSON. HIRAM L. HENDERSON. 

